Lacking or marked by a lack of care
Characterized by unthinking boldness and haste
The first to explore any portion of the mighty river was the reckless and daring adventurer Ordaz.
Now began a period of hasty measures and reckless decrees.
Distress made him, not servile, but reckless and ungovernable.
In all matters of government, Andrew was equally reckless and haphazard.
Mexico has suffered much from the reckless destruction of her forests, not only for industrial purposes but through the careless burning of grassy areas.